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# SimpleDateFormat

`public class SimpleDateFormat`
`` `` `` `extends DateFormat` ``

java.lang.Object
↳ | java.text.Format
| ↳ | android.icu.text.UFormat
|  | ↳ | android.icu.text.DateFormat
|  |  | ↳ | android.icu.text.SimpleDateFormat

[icu enhancement] ICU's replacement for `SimpleDateFormat`. Methods, fields, and other functionality specific to ICU are labeled '[icu]'.

`SimpleDateFormat` is a concrete class for formatting and parsing dates in a locale-sensitive manner. It allows for formatting (date -> text), parsing (text -> date), and normalization.

`SimpleDateFormat` allows you to start by choosing any user-defined patterns for date-time formatting. However, you are encouraged to create a date-time formatter with either `getTimeInstance`, `getDateInstance`, or `getDateTimeInstance` in `DateFormat`. Each of these class methods can return a date/time formatter initialized with a default format pattern. You may modify the format pattern using the `applyPattern` methods as desired. For more information on using these methods, see `DateFormat`.

Date and Time Patterns:

Date and time formats are specified by date and time pattern strings. Within date and time pattern strings, all unquoted ASCII letters [A-Za-z] are reserved as pattern letters representing calendar fields. `SimpleDateFormat` supports the date and time formatting algorithm and pattern letters defined by UTS#35 Unicode Locale Data Markup Language (LDML). The following pattern letters are currently available (note that the actual values depend on CLDR and may change from the examples shown here):

> Field | Sym. | No. | Example | Description
> --- | --- | --- | --- | ---
> era | G | 1..3 | AD | Era - Replaced with the Era string for the current date. One to three letters for the abbreviated form, four letters for the long (wide) form, five for the narrow form.
> 4 | Anno Domini
> 5 | A
> year | y | 1..n | 1996 | Year. Normally the length specifies the padding, but for two letters it also specifies the maximum length. Example:
> Year | y | yy | yyy | yyyy | yyyyy
> --- | --- | --- | --- | --- | ---
> AD 1 | 1 | 01 | 001 | 0001 | 00001
> AD 12 | 12 | 12 | 012 | 0012 | 00012
> AD 123 | 123 | 23 | 123 | 0123 | 00123
> AD 1234 | 1234 | 34 | 1234 | 1234 | 01234
> AD 12345 | 12345 | 45 | 12345 | 12345 | 12345
> Y | 1..n | 1997 | Year (in "Week of Year" based calendars). Normally the length specifies the padding, but for two letters it also specifies the maximum length. This year designation is used in ISO year-week calendar as defined by ISO 8601, but can be used in non-Gregorian based calendar systems where week date processing is desired. May not always be the same value as calendar year.
> u | 1..n | 4601 | Extended year. This is a single number designating the year of this calendar system, encompassing all supra-year fields. For example, for the Julian calendar system, year numbers are positive, with an era of BCE or CE. An extended year value for the Julian calendar system assigns positive values to CE years and negative values to BCE years, with 1 BCE being year 0.
> U | 1..3 | 甲子 | Cyclic year name. Calendars such as the Chinese lunar calendar (and related calendars) and the Hindu calendars use 60-year cycles of year names. Use one through three letters for the abbreviated name, four for the full (wide) name, or five for the narrow name (currently the data only provides abbreviated names, which will be used for all requested name widths). If the calendar does not provide cyclic year name data, or if the year value to be formatted is out of the range of years for which cyclic name data is provided, then numeric formatting is used (behaves like 'y').
> 4 | (currently also 甲子)
> 5 | (currently also 甲子)
> quarter | Q | 1..2 | 02 | Quarter - Use one or two for the numerical quarter, three for the abbreviation, or four for the full (wide) name (five for the narrow name is not yet supported).
> 3 | Q2
> 4 | 2nd quarter
> q | 1..2 | 02 | Stand-Alone Quarter - Use one or two for the numerical quarter, three for the abbreviation, or four for the full name (five for the narrow name is not yet supported).
> 3 | Q2
> 4 | 2nd quarter
> month | M | 1..2 | 09 | Month - Use one or two for the numerical month, three for the abbreviation, four for the full (wide) name, or five for the narrow name. With two ("MM"), the month number is zero-padded if necessary (e.g. "08").
> 3 | Sep
> 4 | September
> 5 | S
> L | 1..2 | 09 | Stand-Alone Month - Use one or two for the numerical month, three for the abbreviation, four for the full (wide) name, or 5 for the narrow name. With two ("LL"), the month number is zero-padded if necessary (e.g. "08").
> 3 | Sep
> 4 | September
> 5 | S
> week | w | 1..2 | 27 | Week of Year. Use "w" to show the minimum number of digits, or "ww" to always show two digits (zero-padding if necessary, e.g. "08").
> W | 1 | 3 | Week of Month
> day | d | 1..2 | 1 | Date - Day of the month. Use "d" to show the minimum number of digits, or "dd" to always show two digits (zero-padding if necessary, e.g. "08").
> D | 1..3 | 345 | Day of year
> F | 1 | 2 | Day of Week in Month. The example is for the 2nd Wed in July
> g | 1..n | 2451334 | Modified Julian day. This is different from the conventional Julian day number in two regards. First, it demarcates days at local zone midnight, rather than noon GMT. Second, it is a local number; that is, it depends on the local time zone. It can be thought of as a single number that encompasses all the date-related fields.
> week day | E | 1..3 | Tue | Day of week - Use one through three letters for the short day, four for the full (wide) name, five for the narrow name, or six for the short name.
> 4 | Tuesday
> 5 | T
> 6 | Tu
> e | 1..2 | 2 | Local day of week. Same as E except adds a numeric value that will depend on the local starting day of the week, using one or two letters. For this example, Monday is the first day of the week.
> 3 | Tue
> 4 | Tuesday
> 5 | T
> 6 | Tu
> c | 1 | 2 | Stand-Alone local day of week - Use one letter for the local numeric value (same as 'e'), three for the short day, four for the full (wide) name, five for the narrow name, or six for the short name.
> 3 | Tue
> 4 | Tuesday
> 5 | T
> 6 | Tu
> period | a | 1 | AM | AM or PM
> hour | h | 1..2 | 11 | Hour [1-12]. When used in skeleton data or in a skeleton passed in an API for flexible data pattern generation, it should match the 12-hour-cycle format preferred by the locale (h or K); it should not match a 24-hour-cycle format (H or k). Use hh for zero padding.
> H | 1..2 | 13 | Hour [0-23]. When used in skeleton data or in a skeleton passed in an API for flexible data pattern generation, it should match the 24-hour-cycle format preferred by the locale (H or k); it should not match a 12-hour-cycle format (h or K). Use HH for zero padding.
> K | 1..2 | 0 | Hour [0-11]. When used in a skeleton, only matches K or h, see above. Use KK for zero padding.
> k | 1..2 | 24 | Hour [1-24]. When used in a skeleton, only matches k or H, see above. Use kk for zero padding.
> minute | m | 1..2 | 59 | Minute. Use "m" to show the minimum number of digits, or "mm" to always show two digits (zero-padding if necessary, e.g. "08")..
> second | s | 1..2 | 12 | Second. Use "s" to show the minimum number of digits, or "ss" to always show two digits (zero-padding if necessary, e.g. "08").
> S | 1..n | 3450 | Fractional Second - truncates (like other time fields) to the count of letters when formatting. Appends zeros if more than 3 letters specified. Truncates at three significant digits when parsing. (example shows display using pattern SSSS for seconds value 12.34567)
> A | 1..n | 69540000 | Milliseconds in day. This field behaves exactly like a composite of all time-related fields, not including the zone fields. As such, it also reflects discontinuities of those fields on DST transition days. On a day of DST onset, it will jump forward. On a day of DST cessation, it will jump backward. This reflects the fact that is must be combined with the offset field to obtain a unique local time value.
> zone | z | 1..3 | PDT | The short specific non-location format. Where that is unavailable, falls back to the short localized GMT format ("O").
> 4 | Pacific Daylight Time | The long specific non-location format. Where that is unavailable, falls back to the long localized GMT format ("OOOO").
> Z | 1..3 | -0800 | The ISO8601 basic format with hours, minutes and optional seconds fields. The format is equivalent to RFC 822 zone format (when optional seconds field is absent). This is equivalent to the "xxxx" specifier.
> 4 | GMT-8:00 | The long localized GMT format. This is equivalent to the "OOOO" specifier.
> 5 | -08:00 -07:52:58 | The ISO8601 extended format with hours, minutes and optional seconds fields. The ISO8601 UTC indicator "Z" is used when local time offset is 0. This is equivalent to the "XXXXX" specifier.
> O | 1 | GMT-8 | The short localized GMT format.
> 4 | GMT-08:00 | The long localized GMT format.
> v | 1 | PT | The short generic non-location format. Where that is unavailable, falls back to the generic location format ("VVVV"), then the short localized GMT format as the final fallback.
> 4 | Pacific Time | The long generic non-location format. Where that is unavailable, falls back to generic location format ("VVVV").
> V | 1 | uslax | The short time zone ID. Where that is unavailable, the special short time zone ID unk (Unknown Zone) is used. Note: This specifier was originally used for a variant of the short specific non-location format, but it was deprecated in the later version of the LDML specification. In CLDR 23/ICU 51, the definition of the specifier was changed to designate a short time zone ID.
> 2 | America/Los_Angeles | The long time zone ID.
> 3 | Los Angeles | The exemplar city (location) for the time zone. Where that is unavailable, the localized exemplar city name for the special zone Etc/Unknown is used as the fallback (for example, "Unknown City").
> 4 | Los Angeles Time | The generic location format. Where that is unavailable, falls back to the long localized GMT format ("OOOO"; Note: Fallback is only necessary with a GMT-style Time Zone ID, like Etc/GMT-830.) This is especially useful when presenting possible timezone choices for user selection, since the naming is more uniform than the "v" format.
> X | 1 | -08 +0530 Z | The ISO8601 basic format with hours field and optional minutes field. The ISO8601 UTC indicator "Z" is used when local time offset is 0.
> 2 | -0800 Z | The ISO8601 basic format with hours and minutes fields. The ISO8601 UTC indicator "Z" is used when local time offset is 0.
> 3 | -08:00 Z | The ISO8601 extended format with hours and minutes fields. The ISO8601 UTC indicator "Z" is used when local time offset is 0.
> 4 | -0800 -075258 Z | The ISO8601 basic format with hours, minutes and optional seconds fields. (Note: The seconds field is not supported by the ISO8601 specification.) The ISO8601 UTC indicator "Z" is used when local time offset is 0.
> 5 | -08:00 -07:52:58 Z | The ISO8601 extended format with hours, minutes and optional seconds fields. (Note: The seconds field is not supported by the ISO8601 specification.) The ISO8601 UTC indicator "Z" is used when local time offset is 0.
> x | 1 | -08 +0530 | The ISO8601 basic format with hours field and optional minutes field.
> 2 | -0800 | The ISO8601 basic format with hours and minutes fields.
> 3 | -08:00 | The ISO8601 extended format with hours and minutes fields.
> 4 | -0800 -075258 | The ISO8601 basic format with hours, minutes and optional seconds fields. (Note: The seconds field is not supported by the ISO8601 specification.)
> 5 | -08:00 -07:52:58 | The ISO8601 extended format with hours, minutes and optional seconds fields. (Note: The seconds field is not supported by the ISO8601 specification.)

Any characters in the pattern that are not in the ranges of ['a'..'z'] and ['A'..'Z'] will be treated as quoted text. For instance, characters like ':', '.', ' ', '#' and '@' will appear in the resulting time text even they are not embraced within single quotes.

A pattern containing any invalid pattern letter will result in a thrown exception during formatting or parsing.

Examples Using the US Locale:

>      Format Pattern                         Result
>      --------------                         -------
>      "yyyy.MM.dd G 'at' HH:mm:ss vvvv" ->>  1996.07.10 AD at 15:08:56 Pacific Time
>      "EEE, MMM d, ''yy"                ->>  Wed, July 10, '96
>      "h:mm a"                          ->>  12:08 PM
>      "hh 'o''clock' a, zzzz"           ->>  12 o'clock PM, Pacific Daylight Time
>      "K:mm a, vvv"                     ->>  0:00 PM, PT
>      "yyyyy.MMMMM.dd GGG hh:mm aaa"    ->>  01996.July.10 AD 12:08 PM

Code Sample:

>      SimpleTimeZone pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, "PST");
>      pdt.setStartRule(Calendar.APRIL, 1, Calendar.SUNDAY, 2*60*60*1000);
>      pdt.setEndRule(Calendar.OCTOBER, -1, Calendar.SUNDAY, 2*60*60*1000);

>      // Format the current time.
>      SimpleDateFormat formatter
>          = new SimpleDateFormat ("yyyy.MM.dd G 'at' hh:mm:ss a zzz");
>      Date currentTime_1 = new Date();
>      String dateString = formatter.format(currentTime_1);

>      // Parse the previous string back into a Date.
>      ParsePosition pos = new ParsePosition(0);
>      Date currentTime_2 = formatter.parse(dateString, pos);

In the example, the time value `currentTime_2` obtained from parsing will be equal to `currentTime_1`. However, they may not be equal if the am/pm marker 'a' is left out from the format pattern while the "hour in am/pm" pattern symbol is used. This information loss can happen when formatting the time in PM.

When parsing a date string using the abbreviated year pattern ("yy"), SimpleDateFormat must interpret the abbreviated year relative to some century. It does this by adjusting dates to be within 80 years before and 20 years after the time the SimpleDateFormat instance is created. For example, using a pattern of "MM/dd/yy" and a SimpleDateFormat instance created on Jan 1, 1997, the string "01/11/12" would be interpreted as Jan 11, 2012 while the string "05/04/64" would be interpreted as May 4, 1964. During parsing, only strings consisting of exactly two digits, as defined by `UCharacter.isDigit(int)`, will be parsed into the default century. Any other numeric string, such as a one digit string, a three or more digit string, or a two digit string that isn't all digits (for example, "-1"), is interpreted literally. So "01/02/3" or "01/02/003" are parsed, using the same pattern, as Jan 2, 3 AD. Likewise, "01/02/-3" is parsed as Jan 2, 4 BC.

If the year pattern does not have exactly two 'y' characters, the year is interpreted literally, regardless of the number of digits. So using the pattern "MM/dd/yyyy", "01/11/12" parses to Jan 11, 12 A.D.

When numeric fields abut one another directly, with no intervening delimiter characters, they constitute a run of abutting numeric fields. Such runs are parsed specially. For example, the format "HHmmss" parses the input text "123456" to 12:34:56, parses the input text "12345" to 1:23:45, and fails to parse "1234". In other words, the leftmost field of the run is flexible, while the others keep a fixed width. If the parse fails anywhere in the run, then the leftmost field is shortened by one character, and the entire run is parsed again. This is repeated until either the parse succeeds or the leftmost field is one character in length. If the parse still fails at that point, the parse of the run fails.

For time zones that have no names, use strings GMT+hours:minutes or GMT-hours:minutes.

The calendar defines what is the first day of the week, the first week of the year, whether hours are zero based or not (0 vs 12 or 24), and the time zone. There is one common decimal format to handle all the numbers; the digit count is handled programmatically according to the pattern.

### Synchronization

Date formats are not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally.

See also:

- `Calendar`
- `GregorianCalendar`
- `TimeZone`
- `DateFormat`
- `DateFormatSymbols`
- `DecimalFormat`
- `TimeZoneFormat`

## Summary

### Inherited constants
From class `android.icu.text.DateFormat`
`String` | `ABBR_GENERIC_TZ` [icu] Constant for generic non-location format, abbreviated if possible, such as PT; used in combinations date + time + zone, or time + zone.
`String` | `ABBR_MONTH` [icu] Constant for date skeleton with abbreviated month.
`String` | `ABBR_MONTH_DAY` [icu] Constant for date skeleton with abbreviated month and day.
`String` | `ABBR_MONTH_WEEKDAY_DAY` [icu] Constant for date skeleton with abbreviated month, weekday, and day.
`String` | `ABBR_QUARTER` [icu] Constant for date skeleton with abbreviated quarter.
`String` | `ABBR_SPECIFIC_TZ` [icu] Constant for specific non-location format, abbreviated if possible, such as PDT; used in combinations date + time + zone, or time + zone.
`String` | `ABBR_UTC_TZ` [icu] Constant for localized GMT/UTC format, such as GMT+8:00 or HPG-8:00; used in combinations date + time + zone, or time + zone.
`String` | `ABBR_WEEKDAY` [icu] Constant for date skeleton with abbreviated weekday.
`int` | `AM_PM_FIELD` FieldPosition selector for 'a' field alignment, corresponding to the `Calendar#AM_PM` field.
`int` | `AM_PM_MIDNIGHT_NOON_FIELD` [icu] FieldPosition selector for 'b' field alignment.
`int` | `DATE_FIELD` FieldPosition selector for 'd' field alignment, corresponding to the `Calendar#DATE` field.
`String` | `DAY` [icu] Constant for date skeleton with day.
`int` | `DAY_OF_WEEK_FIELD` FieldPosition selector for 'E' field alignment, corresponding to the `Calendar#DAY_OF_WEEK` field.
`int` | `DAY_OF_WEEK_IN_MONTH_FIELD` FieldPosition selector for 'F' field alignment, corresponding to the `Calendar#DAY_OF_WEEK_IN_MONTH` field.
`int` | `DAY_OF_YEAR_FIELD` FieldPosition selector for 'D' field alignment, corresponding to the `Calendar#DAY_OF_YEAR` field.
`int` | `DEFAULT` Constant for default style pattern.
`int` | `DOW_LOCAL_FIELD` [icu] FieldPosition selector for 'e' field alignment, corresponding to the `Calendar#DOW_LOCAL` field.
`int` | `ERA_FIELD` FieldPosition selector for 'G' field alignment, corresponding to the `Calendar#ERA` field.
`int` | `EXTENDED_YEAR_FIELD` [icu] FieldPosition selector for 'u' field alignment, corresponding to the `Calendar#EXTENDED_YEAR` field.
`int` | `FLEXIBLE_DAY_PERIOD_FIELD` [icu] FieldPosition selector for 'B' field alignment.
`int` | `FRACTIONAL_SECOND_FIELD` [icu] FieldPosition selector for 'S' field alignment, corresponding to the `Calendar#MILLISECOND` field.
`int` | `FULL` Constant for full style pattern.
`String` | `GENERIC_TZ` [icu] Constant for generic non-location format, such as Pacific Time; used in combinations date + time + zone, or time + zone.
`String` | `HOUR` [icu] Constant for date skeleton with hour, with the locale's preferred hour format (12 or 24).
`int` | `HOUR0_FIELD` FieldPosition selector for 'K' field alignment, corresponding to the `Calendar#HOUR` field.
`int` | `HOUR1_FIELD` FieldPosition selector for 'h' field alignment, corresponding to the `Calendar#HOUR` field.
`String` | `HOUR24` [icu] Constant for date skeleton with hour in 24-hour presentation.
`String` | `HOUR24_MINUTE` [icu] Constant for date skeleton with hour and minute in 24-hour presentation.
`String` | `HOUR24_MINUTE_SECOND` [icu] Constant for date skeleton with hour, minute, and second in 24-hour presentation.
`String` | `HOUR_MINUTE` [icu] Constant for date skeleton with hour and minute, with the locale's preferred hour format (12 or 24).
`String` | `HOUR_MINUTE_SECOND` [icu] Constant for date skeleton with hour, minute, and second, with the locale's preferred hour format (12 or 24).
`int` | `HOUR_OF_DAY0_FIELD` FieldPosition selector for 'H' field alignment, corresponding to the `Calendar#HOUR_OF_DAY` field.
`int` | `HOUR_OF_DAY1_FIELD` FieldPosition selector for 'k' field alignment, corresponding to the `Calendar#HOUR_OF_DAY` field.
`int` | `JULIAN_DAY_FIELD` [icu] FieldPosition selector for 'g' field alignment, corresponding to the `Calendar#JULIAN_DAY` field.
`String` | `LOCATION_TZ` [icu] Constant for generic location format, such as Los Angeles Time; used in combinations date + time + zone, or time + zone.
`int` | `LONG` Constant for long style pattern.
`int` | `MEDIUM` Constant for medium style pattern.
`int` | `MILLISECONDS_IN_DAY_FIELD` [icu] FieldPosition selector for 'A' field alignment, corresponding to the `Calendar#MILLISECONDS_IN_DAY` field.
`int` | `MILLISECOND_FIELD` Alias for FRACTIONAL_SECOND_FIELD.
`String` | `MINUTE` [icu] Constant for date skeleton with minute.
`int` | `MINUTE_FIELD` FieldPosition selector for 'm' field alignment, corresponding to the `Calendar#MINUTE` field.
`String` | `MINUTE_SECOND` [icu] Constant for date skeleton with minute and second.
`String` | `MONTH` [icu] Constant for date skeleton with month.
`String` | `MONTH_DAY` [icu] Constant for date skeleton with long month and day.
`int` | `MONTH_FIELD` FieldPosition selector for 'M' field alignment, corresponding to the `Calendar#MONTH` field.
`String` | `MONTH_WEEKDAY_DAY` [icu] Constant for date skeleton with month, weekday, and day.
`int` | `NONE` [icu] Constant for empty style pattern.
`String` | `NUM_MONTH` [icu] Constant for date skeleton with numeric month.
`String` | `NUM_MONTH_DAY` [icu] Constant for date skeleton with numeric month and day.
`String` | `NUM_MONTH_WEEKDAY_DAY` [icu] Constant for date skeleton with numeric month, weekday, and day.
`String` | `QUARTER` [icu] Constant for date skeleton with quarter.
`int` | `QUARTER_FIELD` [icu] FieldPosition selector for 'Q' field alignment, corresponding to the `Calendar#MONTH` field.
`int` | `RELATIVE` [icu] Constant for relative style mask.
`int` | `RELATIVE_DEFAULT` [icu] Constant for relative default style pattern.
`int` | `RELATIVE_FULL` [icu] Constant for relative full style pattern.
`int` | `RELATIVE_LONG` [icu] Constant for relative style pattern.
`int` | `RELATIVE_MEDIUM` [icu] Constant for relative style pattern.
`int` | `RELATIVE_SHORT` [icu] Constant for relative style pattern.
`String` | `SECOND` [icu] Constant for date skeleton with second.
`int` | `SECOND_FIELD` FieldPosition selector for 's' field alignment, corresponding to the `Calendar#SECOND` field.
`int` | `SHORT` Constant for short style pattern.
`String` | `SPECIFIC_TZ` [icu] Constant for specific non-location format, such as Pacific Daylight Time; used in combinations date + time + zone, or time + zone.
`int` | `STANDALONE_DAY_FIELD` [icu] FieldPosition selector for 'c' field alignment, corresponding to the `Calendar#DAY_OF_WEEK` field.
`int` | `STANDALONE_MONTH_FIELD` [icu] FieldPosition selector for 'L' field alignment, corresponding to the `Calendar#MONTH` field.
`int` | `STANDALONE_QUARTER_FIELD` [icu] FieldPosition selector for 'q' field alignment, corresponding to the `Calendar#MONTH` field.
`int` | `TIMEZONE_FIELD` FieldPosition selector for 'z' field alignment, corresponding to the `Calendar#ZONE_OFFSET` and `Calendar#DST_OFFSET` fields.
`int` | `TIMEZONE_GENERIC_FIELD` [icu] FieldPosition selector for 'v' field alignment, corresponding to the `Calendar#ZONE_OFFSET` and `Calendar#DST_OFFSET` fields.
`int` | `TIMEZONE_ISO_FIELD` [icu] FieldPosition selector for 'X' field alignment, corresponding to the `Calendar#ZONE_OFFSET` and `Calendar#DST_OFFSET` fields.
`int` | `TIMEZONE_ISO_LOCAL_FIELD` [icu] FieldPosition selector for 'x' field alignment, corresponding to the `Calendar#ZONE_OFFSET` and `Calendar#DST_OFFSET` fields.
`int` | `TIMEZONE_LOCALIZED_GMT_OFFSET_FIELD` [icu] FieldPosition selector for 'O' field alignment, corresponding to the `Calendar#ZONE_OFFSET` and `Calendar#DST_OFFSET` fields.
`int` | `TIMEZONE_RFC_FIELD` [icu] FieldPosition selector for 'Z' field alignment, corresponding to the `Calendar#ZONE_OFFSET` and `Calendar#DST_OFFSET` fields.
`int` | `TIMEZONE_SPECIAL_FIELD` [icu] FieldPosition selector for 'V' field alignment, corresponding to the `Calendar#ZONE_OFFSET` and `Calendar#DST_OFFSET` fields.
`String` | `WEEKDAY` [icu] Constant for date skeleton with weekday.
`int` | `WEEK_OF_MONTH_FIELD` FieldPosition selector for 'W' field alignment, corresponding to the `Calendar#WEEK_OF_MONTH` field.
`int` | `WEEK_OF_YEAR_FIELD` FieldPosition selector for 'w' field alignment, corresponding to the `Calendar#WEEK_OF_YEAR` field.
`String` | `YEAR` [icu] Constant for date skeleton with year.
`String` | `YEAR_ABBR_MONTH` [icu] Constant for date skeleton with year and abbreviated month.
`String` | `YEAR_ABBR_MONTH_DAY` [icu] Constant for date skeleton with year, abbreviated month, and day.
`String` | `YEAR_ABBR_MONTH_WEEKDAY_DAY` [icu] Constant for date skeleton with year, abbreviated month, weekday, and day.
`String` | `YEAR_ABBR_QUARTER` [icu] Constant for date skeleton with year and abbreviated quarter.
`int` | `YEAR_FIELD` FieldPosition selector for 'y' field alignment, corresponding to the `Calendar#YEAR` field.
`String` | `YEAR_MONTH` [icu] Constant for date skeleton with year and month.
`String` | `YEAR_MONTH_DAY` [icu] Constant for date skeleton with year, month, and day.
`String` | `YEAR_MONTH_WEEKDAY_DAY` [icu] Constant for date skeleton with year, month, weekday, and day.
`int` | `YEAR_NAME_FIELD` [icu] FieldPosition selector for 'U' field alignment, corresponding to the `Calendar#YEAR` field.
`String` | `YEAR_NUM_MONTH` [icu] Constant for date skeleton with year and numeric month.
`String` | `YEAR_NUM_MONTH_DAY` [icu] Constant for date skeleton with year, numeric month, and day.
`String` | `YEAR_NUM_MONTH_WEEKDAY_DAY` [icu] Constant for date skeleton with year, numeric month, weekday, and day.
`String` | `YEAR_QUARTER` [icu] Constant for date skeleton with year and quarter.
`int` | `YEAR_WOY_FIELD` [icu] FieldPosition selector for 'Y' field alignment, corresponding to the `Calendar#YEAR_WOY` field.

### Inherited fields
From class `android.icu.text.DateFormat`
`protected Calendar` | `calendar` The calendar that `DateFormat` uses to produce the time field values needed to implement date and time formatting.
`protected NumberFormat` | `numberFormat` The number formatter that `DateFormat` uses to format numbers in dates and times.

### Public constructors
`SimpleDateFormat()` Constructs a SimpleDateFormat using the default pattern for the default `FORMAT` locale.
`SimpleDateFormat(String pattern)` Constructs a SimpleDateFormat using the given pattern in the default `FORMAT` locale.
`SimpleDateFormat(String pattern, Locale loc)` Constructs a SimpleDateFormat using the given pattern and locale.
`SimpleDateFormat(String pattern, ULocale loc)` Constructs a SimpleDateFormat using the given pattern and locale.
`SimpleDateFormat(String pattern, String override, ULocale loc)` Constructs a SimpleDateFormat using the given pattern , override and locale.
`SimpleDateFormat(String pattern, DateFormatSymbols formatData)` Constructs a SimpleDateFormat using the given pattern and locale-specific symbol data.

### Public methods
`void` | `applyLocalizedPattern(String pat)` Apply the given localized pattern string to this date format.
`void` | `applyPattern(String pat)` Apply the given unlocalized pattern string to this date format.
`Object` | `clone()` Overrides Cloneable
`boolean` | `equals(Object obj)` Override equals.
`StringBuffer` | `format(Calendar cal, StringBuffer toAppendTo, FieldPosition pos)` Formats a date or time, which is the standard millis since January 1, 1970, 00:00:00 GMT.
`AttributedCharacterIterator` | `formatToCharacterIterator(Object obj)` Format the object to an attributed string, and return the corresponding iterator Overrides superclass method.
`Date` | `get2DigitYearStart()` Returns the beginning date of the 100-year period 2-digit years are interpreted as being within.
`DateFormatSymbols` | `getDateFormatSymbols()` Gets the date/time formatting data.
`NumberFormat` | `getNumberFormat(char field)` give the NumberFormat used for the field like 'y'(year) and 'M'(year)
`TimeZoneFormat` | `getTimeZoneFormat()` [icu] Gets the time zone formatter which this date/time formatter uses to format and parse a time zone.
`int` | `hashCode()` Override hashCode.
`void` | `parse(String text, Calendar cal, ParsePosition parsePos)` Overrides DateFormat
`void` | `set2DigitYearStart(Date startDate)` Sets the 100-year period 2-digit years will be interpreted as being in to begin on the date the user specifies.
`void` | `setContext(DisplayContext context)` [icu] Set a particular DisplayContext value in the formatter, such as CAPITALIZATION_FOR_STANDALONE.
`void` | `setDateFormatSymbols(DateFormatSymbols newFormatSymbols)` Allows you to set the date/time formatting data.
`void` | `setNumberFormat(String fields, NumberFormat overrideNF)` allow the user to set the NumberFormat for several fields It can be a single field like: "y"(year) or "M"(month) It can be several field combined together: "yMd"(year, month and date) Note: 1 symbol field is enough for multiple symbol fields (so "y" will override "yy", "yyy") If the field is not numeric, then override has no effect (like "MMM" will use abbreviation, not numerical field)
`void` | `setNumberFormat(NumberFormat newNumberFormat)` Overrides superclass method and This method also clears per field NumberFormat instances previously set by `setNumberFormat(java.lang.String, android.icu.text.NumberFormat)`
`void` | `setTimeZoneFormat(TimeZoneFormat tzfmt)` [icu] Allows you to set the time zone formatter.
`String` | `toLocalizedPattern()` Return a localized pattern string describing this date format.
`String` | `toPattern()` Return a pattern string describing this date format.

### Protected methods
`DateFormatSymbols` | `getSymbols()` Method for subclasses to access the DateFormatSymbols.
`int` | `matchQuarterString(String text, int start, int field, String[] data, Calendar cal)` Attempt to match the text at a given position against an array of quarter strings.
`int` | `matchString(String text, int start, int field, String[] data, Calendar cal)` Attempt to match the text at a given position against an array of strings.
`DateFormat.Field` | `patternCharToDateFormatField(char ch)` Returns a DateFormat.Field constant associated with the specified format pattern character.
`String` | `subFormat(char ch, int count, int beginOffset, FieldPosition pos, DateFormatSymbols fmtData, Calendar cal)` Formats a single field, given its pattern character.
`int` | `subParse(String text, int start, char ch, int count, boolean obeyCount, boolean allowNegative, boolean[] ambiguousYear, Calendar cal)` Protected method that converts one field of the input string into a numeric field value in `cal`.
`String` | `zeroPaddingNumber(long value, int minDigits, int maxDigits)` Formats a number with the specified minimum and maximum number of digits.

### Inherited methods
From class `android.icu.text.DateFormat`
`Object` | `clone()` Overrides clone.
`boolean` | `equals(Object obj)` Overrides equals.
`final StringBuffer` | `format(Object obj, StringBuffer toAppendTo, FieldPosition fieldPosition)` Formats a time object into a time string.
`StringBuffer` | `format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition)` Formats a Date into a date/time string.
`final String` | `format(Date date)` Formats a Date into a date/time string.
`abstract StringBuffer` | `format(Calendar cal, StringBuffer toAppendTo, FieldPosition fieldPosition)` Formats a date into a date/time string.
`static Locale[]` | `getAvailableLocales()` Returns the set of locales for which DateFormats are installed.
`boolean` | `getBooleanAttribute(DateFormat.BooleanAttribute key)` Returns the current value for the specified BooleanAttribute for this instance if attribute is missing false is returned.
`Calendar` | `getCalendar()` Returns the calendar associated with this date/time formatter.
`DisplayContext` | `getContext(DisplayContext.Type type)` [icu] Get the formatter's DisplayContext value for the specified DisplayContext.Type, such as CAPITALIZATION.
`static final DateFormat` | `getDateInstance(int style, Locale aLocale)` Returns the date formatter with the given formatting style for the given locale.
`static final DateFormat` | `getDateInstance(Calendar cal, int dateStyle)` Creates a `DateFormat` object for the default locale that can be used to format dates in the calendar system specified by `cal`.
`static final DateFormat` | `getDateInstance(Calendar cal, int dateStyle, ULocale locale)` Creates a `DateFormat` object that can be used to format dates in the calendar system specified by `cal`.
`static final DateFormat` | `getDateInstance()` Returns the date formatter with the default formatting style for the default `FORMAT` locale.
`static final DateFormat` | `getDateInstance(int style, ULocale locale)` Returns the date formatter with the given formatting style for the given locale.
`static final DateFormat` | `getDateInstance(Calendar cal, int dateStyle, Locale locale)` Creates a `DateFormat` object that can be used to format dates in the calendar system specified by `cal`.
`static final DateFormat` | `getDateInstance(int style)` Returns the date formatter with the given formatting style for the default `FORMAT` locale.
`static final DateFormat` | `getDateTimeInstance(int dateStyle, int timeStyle)` Returns the date/time formatter with the given date and time formatting styles for the default `FORMAT` locale.
`static final DateFormat` | `getDateTimeInstance()` Returns the date/time formatter with the default formatting style for the default `FORMAT` locale.
`static final DateFormat` | `getDateTimeInstance(Calendar cal, int dateStyle, int timeStyle, ULocale locale)` Creates a `DateFormat` object that can be used to format dates and times in the calendar system specified by `cal`.
`static final DateFormat` | `getDateTimeInstance(Calendar cal, int dateStyle, int timeStyle, Locale locale)` Creates a `DateFormat` object that can be used to format dates and times in the calendar system specified by `cal`.
`static final DateFormat` | `getDateTimeInstance(int dateStyle, int timeStyle, ULocale locale)` Returns the date/time formatter with the given formatting styles for the given locale.
`static final DateFormat` | `getDateTimeInstance(int dateStyle, int timeStyle, Locale aLocale)` Returns the date/time formatter with the given formatting styles for the given locale.
`static final DateFormat` | `getDateTimeInstance(Calendar cal, int dateStyle, int timeStyle)` Creates a `DateFormat` object for the default locale that can be used to format dates and times in the calendar system specified by `cal`.
`static final DateFormat` | `getInstance(Calendar cal)` Returns a default date/time formatter that uses the SHORT style for both the date and the time.
`static final DateFormat` | `getInstance(Calendar cal, Locale locale)` Returns a date/time formatter that uses the SHORT style for both the date and the time.
`static final DateFormat` | `getInstance()` Returns a default date/time formatter that uses the SHORT style for both the date and the time.
`static final DateFormat` | `getInstanceForSkeleton(Calendar cal, String skeleton, Locale locale)` [icu] Creates a `DateFormat` object that can be used to format dates and times in the calendar system specified by `cal`.
`static final DateFormat` | `getInstanceForSkeleton(Calendar cal, String skeleton, ULocale locale)` [icu] Creates a `DateFormat` object that can be used to format dates and times in the calendar system specified by `cal`.
`static final DateFormat` | `getInstanceForSkeleton(String skeleton, ULocale locale)` [icu] Returns a `DateFormat` object that can be used to format dates and times in the given locale.
`static final DateFormat` | `getInstanceForSkeleton(String skeleton, Locale locale)` [icu] Returns a `DateFormat` object that can be used to format dates and times in the given locale.
`static final DateFormat` | `getInstanceForSkeleton(String skeleton)` [icu] Returns a `DateFormat` object that can be used to format dates and times in the default locale.
`NumberFormat` | `getNumberFormat()` Returns the number formatter which this date/time formatter uses to format and parse a time.
`static final DateFormat` | `getPatternInstance(String skeleton, Locale locale)` [icu] Returns a `DateFormat` object that can be used to format dates and times in the given locale.
`static final DateFormat` | `getPatternInstance(String skeleton, ULocale locale)` [icu] Returns a `DateFormat` object that can be used to format dates and times in the given locale.
`static final DateFormat` | `getPatternInstance(String skeleton)` [icu] Returns a `DateFormat` object that can be used to format dates and times in the default locale.
`static final DateFormat` | `getPatternInstance(Calendar cal, String skeleton, Locale locale)` [icu] Creates a `DateFormat` object that can be used to format dates and times in the calendar system specified by `cal`.
`static final DateFormat` | `getPatternInstance(Calendar cal, String skeleton, ULocale locale)` [icu] Creates a `DateFormat` object that can be used to format dates and times in the calendar system specified by `cal`.
`static final DateFormat` | `getTimeInstance(Calendar cal, int timeStyle)` Creates a `DateFormat` object that can be used to format times in the calendar system specified by `cal`.
`static final DateFormat` | `getTimeInstance()` Gets the time formatter with the default formatting style for the default `FORMAT` locale.
`static final DateFormat` | `getTimeInstance(int style, ULocale locale)` Returns the time formatter with the given formatting style for the given locale.
`static final DateFormat` | `getTimeInstance(Calendar cal, int timeStyle, ULocale locale)` Creates a `DateFormat` object that can be used to format times in the calendar system specified by `cal`.
`static final DateFormat` | `getTimeInstance(Calendar cal, int timeStyle, Locale locale)` Creates a `DateFormat` object that can be used to format times in the calendar system specified by `cal`.
`static final DateFormat` | `getTimeInstance(int style)` Returns the time formatter with the given formatting style for the default `FORMAT` locale.
`static final DateFormat` | `getTimeInstance(int style, Locale aLocale)` Returns the time formatter with the given formatting style for the given locale.
`TimeZone` | `getTimeZone()` Returns the time zone.
`int` | `hashCode()` Overrides hashCode.
`boolean` | `isCalendarLenient()` Returns whether date/time parsing in the encapsulated Calendar object is lenient.
`boolean` | `isLenient()` Returns whether both date/time parsing in the encapsulated Calendar object and DateFormat whitespace & numeric processing is lenient.
`Date` | `parse(String text)` Parses a date/time string.
`Date` | `parse(String text, ParsePosition pos)` Parses a date/time string according to the given parse position.
`abstract void` | `parse(String text, Calendar cal, ParsePosition pos)` Parses a date/time string according to the given parse position.
`Object` | `parseObject(String source, ParsePosition pos)` Parses a date/time string into an Object.
`DateFormat` | `setBooleanAttribute(DateFormat.BooleanAttribute key, boolean value)` Sets a boolean attribute for this instance.
`void` | `setCalendar(Calendar newCalendar)` Sets the calendar to be used by this date format.
`void` | `setCalendarLenient(boolean lenient)` Specifies whether date/time parsing in the encapsulated Calendar object should be lenient.
`void` | `setContext(DisplayContext context)` [icu] Set a particular DisplayContext value in the formatter, such as CAPITALIZATION_FOR_STANDALONE.
`void` | `setLenient(boolean lenient)` Specifies whether date/time parsing is to be lenient.
`void` | `setNumberFormat(NumberFormat newNumberFormat)` Sets the number formatter.
`void` | `setTimeZone(TimeZone zone)` Sets the time zone for the calendar of this DateFormat object.
From class `java.text.Format`
`Object` | `clone()` Creates and returns a copy of this object.
`final String` | `format(Object obj)` Formats an object to produce a string.
`abstract StringBuffer` | `format(Object obj, StringBuffer toAppendTo, FieldPosition pos)` Formats an object and appends the resulting text to a given string buffer.
`AttributedCharacterIterator` | `formatToCharacterIterator(Object obj)` Formats an Object producing an `AttributedCharacterIterator`.
`Object` | `parseObject(String source)` Parses text from the beginning of the given string to produce an object.
`abstract Object` | `parseObject(String source, ParsePosition pos)` Parses text from a string to produce an object.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public constructors

### SimpleDateFormat

    public SimpleDateFormat ()

Constructs a SimpleDateFormat using the default pattern for the default `FORMAT` locale. Note: Not all locales support SimpleDateFormat; for full generality, use the factory methods in the DateFormat class.

See also:

- `DateFormat`
- `ULocale.Category.FORMAT`

### SimpleDateFormat

    public SimpleDateFormat (String pattern)

Constructs a SimpleDateFormat using the given pattern in the default `FORMAT` locale. Note: Not all locales support SimpleDateFormat; for full generality, use the factory methods in the DateFormat class.

Parameters
`pattern` | `String`

See also:

- `ULocale.Category.FORMAT`

### SimpleDateFormat

    public SimpleDateFormat (String pattern,
                    Locale loc)

Constructs a SimpleDateFormat using the given pattern and locale. Note: Not all locales support SimpleDateFormat; for full generality, use the factory methods in the DateFormat class.

Parameters
`pattern` | `String`
`loc` | `Locale`

### SimpleDateFormat

    public SimpleDateFormat (String pattern,
                    ULocale loc)

Constructs a SimpleDateFormat using the given pattern and locale. Note: Not all locales support SimpleDateFormat; for full generality, use the factory methods in the DateFormat class.

Parameters
`pattern` | `String`
`loc` | `ULocale`

### SimpleDateFormat

    public SimpleDateFormat (String pattern,
                    String override,
                    ULocale loc)

Constructs a SimpleDateFormat using the given pattern , override and locale.

Parameters
`pattern` | `String`: The pattern to be used
`override` | `String`: The override string. A numbering system override string can take one of the following forms: 1). If just a numbering system name is specified, it applies to all numeric fields in the date format pattern. 2). To specify an alternate numbering system on a field by field basis, use the field letters from the pattern followed by an = sign, followed by the numbering system name. For example, to specify that just the year be formatted using Hebrew digits, use the override "y=hebr". Multiple overrides can be specified in a single string by separating them with a semi-colon. For example, the override string "m=thai;y=deva" would format using Thai digits for the month and Devanagari digits for the year.
`loc` | `ULocale`: The locale to be used

### SimpleDateFormat

    public SimpleDateFormat (String pattern,
                    DateFormatSymbols formatData)

Constructs a SimpleDateFormat using the given pattern and locale-specific symbol data. Warning: uses default `FORMAT` locale for digits!

Parameters
`pattern` | `String`
`formatData` | `DateFormatSymbols`

## Public methods

### applyLocalizedPattern

    public void applyLocalizedPattern (String pat)

Apply the given localized pattern string to this date format.

Parameters
`pat` | `String`

### applyPattern

    public void applyPattern (String pat)

Apply the given unlocalized pattern string to this date format.

Parameters
`pat` | `String`

### clone

    public Object clone ()

Overrides Cloneable

Returns
`Object` | a clone of this instance.

### equals

    public boolean equals (Object obj)

Override equals.

Parameters
`obj` | `Object`: the reference object with which to compare.

Returns
`boolean` | `true` if this object is the same as the obj argument; `false` otherwise.

### format

    public StringBuffer format (Calendar cal,
                    StringBuffer toAppendTo,
                    FieldPosition pos)

Formats a date or time, which is the standard millis since January 1, 1970, 00:00:00 GMT.

Example: using the US locale: "yyyy.MM.dd G 'at' HH:mm:ss zzz" ->> 1996.07.10 AD at 15:08:56 PDT

Parameters
`cal` | `Calendar`: the calendar whose date-time value is to be formatted into a date-time string
`toAppendTo` | `StringBuffer`: where the new date-time text is to be appended
`pos` | `FieldPosition`: the formatting position. On input: an alignment field, if desired. On output: the offsets of the alignment field.

Returns
`StringBuffer` | the formatted date-time string.

See also:

- `DateFormat`

### formatToCharacterIterator

    public AttributedCharacterIterator formatToCharacterIterator (Object obj)

Format the object to an attributed string, and return the corresponding iterator Overrides superclass method.

Parameters
`obj` | `Object`: The object to format

Returns
`AttributedCharacterIterator` | `AttributedCharacterIterator` describing the formatted value.

### get2DigitYearStart

    public Date get2DigitYearStart ()

Returns the beginning date of the 100-year period 2-digit years are interpreted as being within.

Returns
`Date` | the start of the 100-year period into which two digit years are parsed

### getDateFormatSymbols

    public DateFormatSymbols getDateFormatSymbols ()

Gets the date/time formatting data.

Returns
`DateFormatSymbols` | a copy of the date-time formatting data associated with this date-time formatter.

### getNumberFormat

    public NumberFormat getNumberFormat (char field)

give the NumberFormat used for the field like 'y'(year) and 'M'(year)

Parameters
`field` | `char`: the field the user wants

Returns
`NumberFormat` | override NumberFormat used for the field

### getTimeZoneFormat

    public TimeZoneFormat getTimeZoneFormat ()

[icu] Gets the time zone formatter which this date/time formatter uses to format and parse a time zone.

Returns
`TimeZoneFormat` | the time zone formatter which this date/time formatter uses.

### hashCode

    public int hashCode ()

Override hashCode. Generates the hash code for the SimpleDateFormat object

Returns
`int` | a hash code value for this object.

### parse

    public void parse (String text,
                    Calendar cal,
                    ParsePosition parsePos)

Overrides DateFormat

Parameters
`text` | `String`: The date/time string to be parsed
`cal` | `Calendar`: The calendar set on input to the date and time to be used for missing values in the date/time string being parsed, and set on output to the parsed date/time. In general, this should be initialized before calling this method - either cleared or set to the current date, depending on desired behavior. If this parse fails, the calendar may still have been modified. When the calendar type is different from the internal calendar held by this DateFormat instance, calendar field values will be parsed based on the internal calendar initialized with the time and the time zone taken from this calendar, then the parse result (time in milliseconds and time zone) will be set back to this calendar.
`parsePos` | `ParsePosition`: On input, the position at which to start parsing; on output, the position at which parsing terminated, or the start position if the parse failed.

See also:

- `DateFormat`

### set2DigitYearStart

    public void set2DigitYearStart (Date startDate)

Sets the 100-year period 2-digit years will be interpreted as being in to begin on the date the user specifies.

Parameters
`startDate` | `Date`: During parsing, two digit years will be placed in the range `startDate` to `startDate + 100 years`.

### setContext

    public void setContext (DisplayContext context)

[icu] Set a particular DisplayContext value in the formatter, such as CAPITALIZATION_FOR_STANDALONE. Note: For getContext, see DateFormat.

Parameters
`context` | `DisplayContext`: The DisplayContext value to set.

### setDateFormatSymbols

    public void setDateFormatSymbols (DateFormatSymbols newFormatSymbols)

Allows you to set the date/time formatting data.

Parameters
`newFormatSymbols` | `DateFormatSymbols`: the new symbols

### setNumberFormat

    public void setNumberFormat (String fields,
                    NumberFormat overrideNF)

allow the user to set the NumberFormat for several fields It can be a single field like: "y"(year) or "M"(month) It can be several field combined together: "yMd"(year, month and date) Note: 1 symbol field is enough for multiple symbol fields (so "y" will override "yy", "yyy") If the field is not numeric, then override has no effect (like "MMM" will use abbreviation, not numerical field)

Parameters
`fields` | `String`: the fields to override
`overrideNF` | `NumberFormat`: the NumbeferFormat used

Throws
`IllegalArgumentException` | when the fields contain invalid field

### setNumberFormat

    public void setNumberFormat (NumberFormat newNumberFormat)

Overrides superclass method and This method also clears per field NumberFormat instances previously set by `setNumberFormat(java.lang.String, android.icu.text.NumberFormat)`

Parameters
`newNumberFormat` | `NumberFormat`: the given new NumberFormat.

### setTimeZoneFormat

    public void setTimeZoneFormat (TimeZoneFormat tzfmt)

[icu] Allows you to set the time zone formatter.

Parameters
`tzfmt` | `TimeZoneFormat`: the new time zone formatter

### toLocalizedPattern

    public String toLocalizedPattern ()

Return a localized pattern string describing this date format.

Note: This implementation depends on `DateFormatSymbols#getLocalPatternChars()` to get localized format pattern characters. ICU does not include localized pattern character data, therefore, unless user sets localized pattern characters manually, this method returns the same result as `toPattern()`.

Returns
`String` |

### toPattern

    public String toPattern ()

Return a pattern string describing this date format.

Returns
`String` |

## Protected methods

### getSymbols

    protected DateFormatSymbols getSymbols ()

Method for subclasses to access the DateFormatSymbols.

Returns
`DateFormatSymbols` |

### matchQuarterString

    protected int matchQuarterString (String text,
                    int start,
                    int field,
                    String[] data,
                    Calendar cal)

Attempt to match the text at a given position against an array of quarter strings. Since multiple strings in the array may match (for example, if the array contains "a", "ab", and "abc", all will match the input string "abcd") the longest match is returned. As a side effect, the given field of `cal` is set to the index of the best match, if there is one.

Parameters
`text` | `String`: the time text being parsed.
`start` | `int`: where to start parsing.
`field` | `int`: the date field being parsed.
`data` | `String`: the string array to parsed.
`cal` | `Calendar`

Returns
`int` | the new start position if matching succeeded; a negative number indicating matching failure, otherwise. As a side effect, sets the `cal` field `field` to the index of the best match, if matching succeeded.

### matchString

    protected int matchString (String text,
                    int start,
                    int field,
                    String[] data,
                    Calendar cal)

Attempt to match the text at a given position against an array of strings. Since multiple strings in the array may match (for example, if the array contains "a", "ab", and "abc", all will match the input string "abcd") the longest match is returned. As a side effect, the given field of `cal` is set to the index of the best match, if there is one.

Parameters
`text` | `String`: the time text being parsed.
`start` | `int`: where to start parsing.
`field` | `int`: the date field being parsed.
`data` | `String`: the string array to parsed.

Returns
`int` | the new start position if matching succeeded; a negative number indicating matching failure, otherwise. As a side effect, sets the `cal` field `field` to the index of the best match, if matching succeeded.

### patternCharToDateFormatField

    protected DateFormat.Field patternCharToDateFormatField (char ch)

Returns a DateFormat.Field constant associated with the specified format pattern character.

Parameters
`ch` | `char`: The pattern character

Returns
`DateFormat.Field` | DateFormat.Field associated with the pattern character

### subFormat

    protected String subFormat (char ch,
                    int count,
                    int beginOffset,
                    FieldPosition pos,
                    DateFormatSymbols fmtData,
                    Calendar cal)

Formats a single field, given its pattern character. Subclasses may override this method in order to modify or add formatting capabilities.

Parameters
`ch` | `char`: the pattern character
`count` | `int`: the number of times ch is repeated in the pattern
`beginOffset` | `int`: the offset of the output string at the start of this field; used to set pos when appropriate
`pos` | `FieldPosition`: receives the position of a field, when appropriate
`fmtData` | `DateFormatSymbols`: the symbols for this formatter
`cal` | `Calendar`

Returns
`String` |

Throws
`IllegalArgumentException` |

### subParse

    protected int subParse (String text,
                    int start,
                    char ch,
                    int count,
                    boolean obeyCount,
                    boolean allowNegative,
                    boolean[] ambiguousYear,
                    Calendar cal)

Protected method that converts one field of the input string into a numeric field value in `cal`. Returns -start (for ParsePosition) if failed. Subclasses may override this method to modify or add parsing capabilities.

Parameters
`text` | `String`: the time text to be parsed.
`start` | `int`: where to start parsing.
`ch` | `char`: the pattern character for the date field text to be parsed.
`count` | `int`: the count of a pattern character.
`obeyCount` | `boolean`: if true, then the next field directly abuts this one, and we should use the count to know when to stop parsing.
`allowNegative` | `boolean`
`ambiguousYear` | `boolean`: return parameter; upon return, if ambiguousYear[0] is true, then a two-digit year was parsed and may need to be readjusted.

Returns
`int` | the new start position if matching succeeded; a negative number indicating matching failure, otherwise. As a side effect, set the appropriate field of `cal` with the parsed value.

### zeroPaddingNumber

    protected String zeroPaddingNumber (long value,
                    int minDigits,
                    int maxDigits)

Formats a number with the specified minimum and maximum number of digits.

Parameters
`value` | `long`
`minDigits` | `int`
`maxDigits` | `int`

Returns
`String` |

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